Rock-drill.



4Patented Mar. 26, |901.

ROCK DRILL. (Application mea Jan. 15, 190x.)

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(No Model.)

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ATENT OFFICE.

WARREN WOOD, OF PATERSON, NEV JERSEY.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 670,750, dated March 26, 1901.

Application led January l5. 1901. berial No. 43,367. (No model.)

To all w/tont it N71/,ty concern:

Be it known that l, VARREN WOOD, a citizen of theUnited States, residingin Paterson, in the county of Passaic and State of New Jersey, have invented a certain new and useful Improvement in Rock-Drills, of which the following is a specification.

The invention relates to means for holding the packing sleeve or gland for the pistonrod secu rely to the front head or lower cylinder-head; and the object ot' the invention is to secu re the gland and its holding bolts and nuts against accidental loosening and displacement under the severe vibration and rough usage to which machinery of this type is necessarily subjected.

The invention consists in providing internal recesses in the cylinder-head in which the heads of the bolts are received and are locked in position by the gland and in formingslight ridges on the gland/flanges adjacent to the holes through which the bolts extend and producing corresponding grooves or channels on the bearing-face of each nut matching to the ridges and serving to prevent the nuts from loosening` or backing off. The resiliency of the packing allows the nuts to be turned to the proper extent by yielding, while the plane portions of the nuts pass the ridges and again expanding when the grooves and ridges coincide, the elasticityof the packing thus exerting sufficient force'to insure engagement, but allowing the parts to be forcibly separated when necessary.

The accompanying drawings form a part of this specification and show the invention as I have carried it out.

Figure l is a side elevation of the lower portion of a rock-drill cylinder constructed in accordance with the invention. Figs. 2, 3, 4, and 5 are on a larger scale and show the front head and its equipments. Fig. 2 is an end view. Fig. is a vertical section on the line 3 3 in Fig. 2. Fig. a is a corresponding section on the line 4 4in Fig. 2. Fig. is an elevation showing the inner `face of one portion of the head. The remaining iigures are on a still larger scale. Fig. 6 is a View of the under face of a portion of the gland-sections alone. Fig. 7 is a corresponding side View showing a nut in place, and Fig. 8 is an end admit the piston-rod B and is counterbored to receive the packing C and the packingsleeve sections D D, serving as a gland to compress the packing.

At the lower end of the head are internal cavities or recesses a a produced in the castings, opening into the space occupied by the gland,and adapted to receive the square heads E E'of the boltsE E, extendingthrough slots a d', communicating with the recesses, but smaller than the latter, and adapted to match to the body portions of the bolts. The screwthreaded outer ends extend beyond the lower face of the head and pass through openings d d in the gland-fiange D and receive nuts EZEZ.

In assembling these parts the bolts are iirst inserted in the recesses a a, and the two portions of the head applied to inclose the piston-rod and bolted together. The packingrings are next placed on the rod, and then the gland is applied in tWo pieces and forced into the head, thus locking the bolts in place by closing the entrances to the recesses and filling the annular space around the rod. The nuts are then applied and hold the gland stronglyin place. Thus bound together it is obviouslyimpossible for the bolts to drop out, so long as the gland is securely held. To insure the nuts E2 E2 against accidental turning to release the gland, I provide two or more slight grooves or channels e e on the under face of each, adapted to engage with the ridges D2 D2 on the gland-tlange D', adjacent to the openings d d. The ridges are slight, and the grooves are rounded, as shown, to permit the nuts to be turned by the application of sufficient force, the lands or plane portions between the grooves riding the ridges by forcing the gland inward against the yielding resistance offered by the packing. The nut IOO is inally located with two of its grooves matching to and engaged with the ridges. Thus conditioned the reverse movement of the nut cannot be initiated without again compressing the packing, and when the drill is sinking vertical or angular holes the locking is aided by the gravity of the gland-sections tending to rest upon the nuts, and thus further insure engagement with the grooves.

In addition to the'obvious advantages of insuring the parts againstseparation and consequent accident the inside arrangement of the bolts avoids outside cavities liable to become illed with grease and dust and allows the exterior of the casting to present an unbroken appearance.

I claim- 1. In a rock-drill, a cylinder-head, a gland fitting therein and having a fiange, holdingbolts secu ring the gland to the head, inwardlyopening recesses in the latter receiving the heads of said bolts, the body portions thereof lying in slots opening -into said recesses and extending axially of said head through said flange and receiving nuts on their outer ends, whereby the heads of said bolts are locked in said recesses by said gland, all substantially as herein specified.

2. A cylinder-head, an elastic packing and a gland therein, a iiange on the latter, and

bolts received in said head and extending through said flange, in combination with ridges on said flange adjacent to said bolts, and nuts matching to the bolts and having grooves on their bearing-faces adapted to engage with said ridges, whereby said nuts are held against accidental loosening, all substantially as and for the purposes herein specied.

3. The cylinder-head A having the inwardly-opening recesses aa and slots a d communicating with said recesses, bolts E E having their heads E' E received in said recesses and their body portions in said slots, a gland D fitting in said head and locking said bolts in place, a flange D' on said gland having the holes d d receiving the outer ends of bolts, ridges D2 D2 on said liange adjacent to said holes, and nuts E2 E2 having grooves e e on their bearing-faces adapted to engage said ridges, all combined and arranged to serve substantially as and for the purposes specified.

I n testimony that I claim the invention above set forth I afx my signature in presence of two witnesses.

WARREN WOOD.

Witnesses:

CHARLES R. SEARLE, EDWIN GOULD. 

